Yao Ling and Hu Xiaozhen, who parted ways due to a misunderstanding in childhood, reunited in the academy after they grew up. The infatuated female protagonist hopes to continue writing a sweet journey with the male protagonist, but due to the appearance of the mysterious administrator, Ma Shen, accidents occur frequently. Under the lure of Ma Shen's plan, the two became acting administrators and they help spirits to realize their long-cherished dreams, in order to continue their progress in love. Through the experience of missions again and again, the relationship between Hu and Yao becomes deeper and deeper, and they are moving towards the road of righteousness. But the true purpose of Ma Shen gradually implicates the operating laws behind the world, and more mysteries, and dangers lie between the hero and heroine. (Source: Bilibili, translated & edited)

A summary of season one of Tensei shitara Slime Datta Ken with some extra content leading into season two.

When Masamune Makabe was a child, he was rejected by a rich, beautiful girl named Aki Adagaki, who gave him the nickname ''Piggy'' for being overweight. Devastated, Masamune put great effort into working out to improve his appearance. Now a handsome yet narcissistic high school student, Masamune is determined to exact revenge—he will have Aki fall madly in love with him and ultimately reject her the next time they meet. To his surprise, Masamune discovers he has transferred into Aki's school. Setting his plan into motion, Masamune first begins to form a relationship with the ''Brutal Princess'' but, despite his efforts, fails miserably at his initial attempts. Shockingly, when Masamune finally progresses towards his vengeance, he receives a mysterious letter addressing him by his old nickname. Unless Masamune discovers the sender's identity, his plan is doomed before it even starts!

Taking a break from his time as a teacher, the powerful slime Rimuru Tempest returns to his kingdom, eponymously named Tempest, just in time to begin negotiations with a nearby nation—the Kingdom of Eurazania. While the negotiations are anything but peaceful, they do end successfully, allowing Rimuru to return and finish teaching. When trying to again return to Tempest, this time permanently, Rimuru is stopped by a mysterious figure who is somehow able to constrain the many magical abilities he has at his disposal. In Tempest, the situation is even worse. A group of unknown humans has invaded the land and are assaulting its citizens, both influential and innocent. They are not just trying to bring harm either—they have the intent to kill. Can Rimuru overcome his powerful and dangerous foe and return to Tempest before it is too late?